text: # Copyright 2013-2022 Lawrence Livermore National Security, LLC and other
  # Spack Project Developers. See the top-level COPYRIGHT file for details.
  #
  # SPDX-License-Identifier: (Apache-2.0 OR MIT)
  import glob
  import itertools
  import os
  import re
  import sys
  
  import llnl.util.tty as tty
  
  import spack.platforms
  import spack.util.executable
  from spack.build_environment import dso_suffix
  from spack.operating_systems.mac_os import macos_sdk_path, macos_version
  
  
  class Gcc(AutotoolsPackage, GNUMirrorPackage):
      """The GNU Compiler Collection includes front ends for C, C++, Objective-C,
      Fortran, Ada, and Go, as well as libraries for these languages."""
  
      homepage = 'https://gcc.gnu.org'
      gnu_mirror_path = 'gcc/gcc-9.2.0/gcc-9.2.0.tar.xz'
      git      = 'git://gcc.gnu.org/git/gcc.git'
      list_url = 'https://ftp.gnu.org/gnu/gcc/'
      list_depth = 1
  
      maintainers = ['michaelkuhn', 'alalazo']
  
      version('master', branch='master')
  
      version('11.2.0', sha256='d08edc536b54c372a1010ff6619dd274c0f1603aa49212ba20f7aa2cda36fa8b')
      version('11.1.0', sha256='4c4a6fb8a8396059241c2e674b85b351c26a5d678274007f076957afa1cc9ddf')
  
      version('10.3.0', sha256='64f404c1a650f27fc33da242e1f2df54952e3963a49e06e73f6940f3223ac344')
      version('10.2.0', sha256='b8dd4368bb9c7f0b98188317ee0254dd8cc99d1e3a18d0ff146c855fe16c1d8c')
      version('10.1.0', sha256='b6898a23844b656f1b68691c5c012036c2e694ac4b53a8918d4712ad876e7ea2')
  
      version('9.4.0', sha256='c95da32f440378d7751dd95533186f7fc05ceb4fb65eb5b85234e6299eb9838e')
      version('9.3.0', sha256='71e197867611f6054aa1119b13a0c0abac12834765fe2d81f35ac57f84f742d1')
      version('9.2.0', sha256='ea6ef08f121239da5695f76c9b33637a118dcf63e24164422231917fa61fb206')
      version('9.1.0', sha256='79a66834e96a6050d8fe78db2c3b32fb285b230b855d0a66288235bc04b327a0')
  
      version('8.5.0', sha256='d308841a511bb830a6100397b0042db24ce11f642dab6ea6ee44842e5325ed50')
      version('8.4.0', sha256='e30a6e52d10e1f27ed55104ad233c30bd1e99cfb5ff98ab022dc941edd1b2dd4')
      version('8.3.0', sha256='64baadfe6cc0f4947a84cb12d7f0dfaf45bb58b7e92461639596c21e02d97d2c')
      version('8.2.0', sha256='196c3c04ba2613f893283977e6011b2345d1cd1af9abeac58e916b1aab3e0080')
      version('8.1.0', sha256='1d1866f992626e61349a1ccd0b8d5253816222cdc13390dcfaa74b093aa2b153')
  
      version('7.5.0', sha256='b81946e7f01f90528a1f7352ab08cc602b9ccc05d4e44da4bd501c5a189ee661')
      version('7.4.0', sha256='eddde28d04f334aec1604456e536416549e9b1aa137fc69204e65eb0c009fe51')
      version('7.3.0', sha256='832ca6ae04636adbb430e865a1451adf6979ab44ca1c8374f61fba65645ce15c')
      version('7.2.0', sha256='1cf7adf8ff4b5aa49041c8734bbcf1ad18cc4c94d0029aae0f4e48841088479a')
      version('7.1.0', sha256='8a8136c235f64c6fef69cac0d73a46a1a09bb250776a050aec8f9fc880bebc17')
  
      version('6.5.0', sha256='7ef1796ce497e89479183702635b14bb7a46b53249209a5e0f999bebf4740945')
      version('6.4.0', sha256='850bf21eafdfe5cd5f6827148184c08c4a0852a37ccf36ce69855334d2c914d4')
      version('6.3.0', sha256='f06ae7f3f790fbf0f018f6d40e844451e6bc3b7bc96e128e63b09825c1f8b29f')
      version('6.2.0', sha256='9944589fc722d3e66308c0ce5257788ebd7872982a718aa2516123940671b7c5')
      version('6.1.0', sha256='09c4c85cabebb971b1de732a0219609f93fc0af5f86f6e437fd8d7f832f1a351')
  
      version('5.5.0', sha256='530cea139d82fe542b358961130c69cfde8b3d14556370b65823d2f91f0ced87')
      version('5.4.0', sha256='608df76dec2d34de6558249d8af4cbee21eceddbcb580d666f7a5a583ca3303a')
      version('5.3.0', sha256='b84f5592e9218b73dbae612b5253035a7b34a9a1f7688d2e1bfaaf7267d5c4db')
      version('5.2.0', sha256='5f835b04b5f7dd4f4d2dc96190ec1621b8d89f2dc6f638f9f8bc1b1014ba8cad')
      version('5.1.0', sha256='b7dafdf89cbb0e20333dbf5b5349319ae06e3d1a30bf3515b5488f7e89dca5ad')
  
      version('4.9.4', sha256='6c11d292cd01b294f9f84c9a59c230d80e9e4a47e5c6355f046bb36d4f358092')
      version('4.9.3', sha256='2332b2a5a321b57508b9031354a8503af6fdfb868b8c1748d33028d100a8b67e')
      version('4.9.2', sha256='2020c98295856aa13fda0f2f3a4794490757fc24bcca918d52cc8b4917b972dd')
      version('4.9.1', sha256='d334781a124ada6f38e63b545e2a3b8c2183049515a1abab6d513f109f1d717e')
      version('4.8.5', sha256='22fb1e7e0f68a63cee631d85b20461d1ea6bda162f03096350e38c8d427ecf23')
      version('4.8.4', sha256='4a80aa23798b8e9b5793494b8c976b39b8d9aa2e53cd5ed5534aff662a7f8695')
      version('4.7.4', sha256='92e61c6dc3a0a449e62d72a38185fda550168a86702dea07125ebd3ec3996282')
      version('4.6.4', sha256='35af16afa0b67af9b8eb15cafb76d2bc5f568540552522f5dc2c88dd45d977e8')
      version('4.5.4', sha256='eef3f0456db8c3d992cbb51d5d32558190bc14f3bc19383dd93acc27acc6befc')
  
      # We specifically do not add 'all' variant here because:
      # (i) Ada, Go, Jit, and Objective-C++ are not default languages.
      # In that respect, the name 'all' is rather misleading.
      # (ii) Languages other than c,c++,fortran are prone to configure bug in GCC
      # For example, 'java' appears to ignore custom location of zlib
      # (iii) meaning of 'all' changes with GCC version, i.e. 'java' is not part
      # of gcc7. Correctly specifying conflicts() and depends_on() in such a
      # case is a PITA.
      variant('languages',
              default='c,c++,fortran',
              values=('ada', 'brig', 'c', 'c++', 'fortran',
                      'go', 'java', 'jit', 'lto', 'objc', 'obj-c++'),
              multi=True,
              description='Compilers and runtime libraries to build')
      variant('binutils',
              default=False,
              description='Build via binutils')
      variant('piclibs',
              default=False,
              description='Build PIC versions of libgfortran.a and libstdc++.a')
      variant('strip',
              default=False,
              description='Strip executables to reduce installation size')
      variant('nvptx',
              default=False,
              description='Target nvptx offloading to NVIDIA GPUs')
      variant('bootstrap',
              default=True,
              description='Enable 3-stage bootstrap')
      variant('graphite',
              default=False,
              description='Enable Graphite loop optimizations (requires ISL)')
  
      depends_on('flex', type='build', when='@master')
  
      # https://gcc.gnu.org/install/prerequisites.html
      depends_on('gmp@4.3.2:')
      # GCC 7.3 does not compile with newer releases on some platforms, see
      #   https://github.com/spack/spack/issues/6902#issuecomment-433030376
      depends_on('mpfr@2.4.2:3.1.6', when='@:9.9')
      depends_on('mpfr@3.1.0:', when='@10:')
      depends_on('mpc@1.0.1:', when='@4.5:')
      # Already released GCC versions do not support any newer version of ISL
      #   GCC 5.4 https://github.com/spack/spack/issues/6902#issuecomment-433072097
      #   GCC 7.3 https://github.com/spack/spack/issues/6902#issuecomment-433030376
      #   GCC 9+  https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86724
      with when('+graphite'):
          depends_on('isl@0.14', when='@5.0:5.2')
          depends_on('isl@0.15', when='@5.3:5.9')
          depends_on('isl@0.15:0.18', when='@6:8.9')
          depends_on('isl@0.15:0.20', when='@9:9.9')
          depends_on('isl@0.15:', when='@10:')
  
      depends_on('zlib', when='@6:')
      depends_on('zstd', when='@10:')
      depends_on('diffutils', type='build')
      depends_on('iconv', when='platform=darwin')
      depends_on('gnat', when='languages=ada')
      depends_on('binutils+gas+ld+plugins~libiberty', when='+binutils', type=('build', 'link', 'run'))
      depends_on('zip', type='build', when='languages=java')
  
      # The server is sometimes a bit slow to respond
      timeout = {'timeout': 60}
  
      # TODO: integrate these libraries.
      # depends_on('ppl')
      # depends_on('cloog')
  
      # https://gcc.gnu.org/install/test.html
      depends_on('dejagnu@1.4.4', type='test')
      depends_on('expect', type='test')
      depends_on('tcl', type='test')
      depends_on('autogen@5.5.4:', type='test')
      depends_on('guile@1.4.1:', type='test')
  
      # See https://golang.org/doc/install/gccgo#Releases
      with when('languages=go'):
          provides('golang',        when='@4.6:')
          provides('golang@:1',     when='@4.7.1:')
          provides('golang@:1.1',   when='@4.8:')
          provides('golang@:1.1.2', when='@4.8.2:')
          provides('golang@:1.2',   when='@4.9:')
          provides('golang@:1.4',   when='@5:')
          provides('golang@:1.6.1', when='@6:')
          provides('golang@:1.8',   when='@7:')
          # GCC 4.6 added support for the Go programming language.
          # See https://gcc.gnu.org/gcc-4.6/changes.html
          conflicts('@:4.5', msg='support for Go has been added in GCC 4.6')
          # Go is not supported on macOS
          conflicts('platform=darwin', msg='Go not supported on MacOS')
  
      # For a list of valid languages for a specific release,
      # run the following command in the GCC source directory:
      #    $ grep ^language= gcc/*/config-lang.in
      # See https://gcc.gnu.org/install/configure.html
  
      # Support for processing BRIG 1.0 files was added in GCC 7
      # BRIG is a binary format for HSAIL:
      # (Heterogeneous System Architecture Intermediate Language).
      # See https://gcc.gnu.org/gcc-7/changes.html
      conflicts('languages=brig', when='@:6')
  
      # BRIG does not seem to be supported on macOS
      conflicts('languages=brig', when='platform=darwin')
  
      # GCC 4.8 added a 'c' language. I'm sure C was always built,
      # but this is the first version that accepts 'c' as a valid language.
      conflicts('languages=c', when='@:4.7')
  
      # The GCC Java frontend and associated libjava runtime library
      # have been removed from GCC as of GCC 7.
      # See https://gcc.gnu.org/gcc-7/changes.html
      conflicts('languages=java', when='@7:')
  
      # GCC 5 added the ability to build GCC as a Just-In-Time compiler.
      # See https://gcc.gnu.org/gcc-5/changes.html
      conflicts('languages=jit', when='@:4')
  
      with when('+nvptx'):
          depends_on('cuda')
          resource(
              name='newlib',
              url='ftp://sourceware.org/pub/newlib/newlib-3.0.0.20180831.tar.gz',
              sha256='3ad3664f227357df15ff34e954bfd9f501009a647667cd307bf0658aefd6eb5b',
              destination='newlibsource',
              fetch_options=timeout
          )
          # nvptx-tools does not seem to work as a dependency,
          # but does fine when the source is inside the gcc build directory
          # nvptx-tools doesn't have any releases, so grabbing the last commit
          resource(
              name='nvptx-tools',
              git='https://github.com/MentorEmbedded/nvptx-tools',
              commit='d0524fbdc86dfca068db5a21cc78ac255b335be5',
          )
          # NVPTX offloading supported in 7 and later by limited languages
          conflicts('@:6', msg='NVPTX only supported in gcc 7 and above')
          conflicts('languages=ada')
          conflicts('languages=brig')
          conflicts('languages=go')
          conflicts('languages=java')
          conflicts('languages=jit')
          conflicts('languages=objc')
          conflicts('languages=obj-c++')
          # NVPTX build disables bootstrap
          conflicts('+bootstrap')
  
      # Binutils can't build ld on macOS
      conflicts('+binutils', when='platform=darwin')
  
      # aarch64/M1 is supported in GCC 12+
      conflicts('@:11.99', when='target=aarch64: platform=darwin',
                msg='Only GCC 12 and newer support macOS M1 (aarch64)')
  
      # Newer binutils than RHEL's is required to run `as` on some instructions
      # generated by new GCC (see https://github.com/spack/spack/issues/12235)
      conflicts('~binutils', when='@7: os=rhel6',
                msg='New GCC cannot use system assembler on RHEL6')
  
      # GCC 11 requires GCC 4.8 or later (https://gcc.gnu.org/gcc-11/changes.html)
      conflicts('%gcc@:4.7', when='@11:')
  
      if sys.platform == 'darwin':
          # Fix parallel build on APFS filesystem
          # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81797
          if macos_version() >= Version('10.13'):
              patch('darwin/apfs.patch', when='@5.5.0,6.1:6.4,7.1:7.3')
              # from homebrew via macports
              # https://trac.macports.org/ticket/56502#no1
              # see also: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83531
              patch('darwin/headers-10.13-fix.patch', when='@5.5.0')
          if macos_version() >= Version('10.14'):
              # Fix system headers for Mojave SDK:
              # https://github.com/Homebrew/homebrew-core/pull/39041
              patch('https://raw.githubusercontent.com/Homebrew/formula-patches/master/gcc/8.3.0-xcode-bug-_Atomic-fix.patch',
                    sha256='33ee92bf678586357ee8ab9d2faddf807e671ad37b97afdd102d5d153d03ca84',
                    when='@6:8')
          if macos_version() >= Version('10.15'):
              # Fix system headers for Catalina SDK
              # (otherwise __OSX_AVAILABLE_STARTING ends up undefined)
              patch('https://raw.githubusercontent.com/Homebrew/formula-patches/b8b8e65e/gcc/9.2.0-catalina.patch',
                    sha256='0b8d14a7f3c6a2f0d2498526e86e088926671b5da50a554ffa6b7f73ac4f132b', when='@9.2.0')
          # Use -headerpad_max_install_names in the build,
          # otherwise updated load commands won't fit in the Mach-O header.
          # This is needed because `gcc` avoids the superenv shim.
          patch('darwin/gcc-7.1.0-headerpad.patch', when='@5:11')
          patch('darwin/gcc-6.1.0-jit.patch', when='@5:7')
          patch('darwin/gcc-4.9.patch1', when='@4.9.0:4.9.3')
          patch('darwin/gcc-4.9.patch2', when='@4.9.0:4.9.3')
  
      patch('piclibs.patch', when='+piclibs')
      patch('gcc-backport.patch', when='@4.7:4.9.3,5:5.3')
  
      # Backport libsanitizer patch for glibc >= 2.31 and 5.3.0 <= gcc <= 9.2.0
      # https://bugs.gentoo.org/708346
      patch('glibc-2.31-libsanitizer-1.patch', when='@7.1.0:7.5.0,8.1.0:8.3.0,9.0.0:9.2.0')
      patch('glibc-2.31-libsanitizer-1-gcc-6.patch', when='@5.3.0:5.5.0,6.1.0:6.5.0')
      patch('glibc-2.31-libsanitizer-2.patch', when='@8.1.0:8.3.0,9.0.0:9.2.0')
      patch('glibc-2.31-libsanitizer-2-gcc-6.patch', when='@5.3.0:5.5.0,6.1.0:6.5.0')
      patch('glibc-2.31-libsanitizer-2-gcc-7.patch', when='@7.1.0:7.5.0')
      patch('https://gcc.gnu.org/git/?p=gcc.git;a=patch;h=2b40941d23b1570cdd90083b58fa0f66aa58c86e', sha256='b48e48736062e64a6da7cbe7e21a6c1c89422d1f49ef547c73b479a3f3f4935f', when='@6.5.0,7.4.0:7.5.0,8.2.0:9.3.0')
      patch('https://gcc.gnu.org/git/?p=gcc.git;a=patch;h=745dae5923aba02982563481d75a21595df22ff8', sha256='eaa00c91e08a5e767f023911a49bc1b2d1a3eea38703b745ab260f90e8da41aa', when='@10.1.0:11.1.0')
  
      # Older versions do not compile with newer versions of glibc
      # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81712
      patch('ucontext_t.patch', when='@4.9,5.1:5.4,6.1:6.4,7.1')
      patch('ucontext_t-java.patch', when='@4.9,5.1:5.4,6.1:6.4 languages=java')
      # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81066
      patch('stack_t-4.9.patch', when='@4.9')
      patch('stack_t.patch', when='@5.1:5.4,6.1:6.4,7.1')
      # https://bugs.busybox.net/show_bug.cgi?id=10061
      patch('signal.patch', when='@4.9,5.1:5.4')
      # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85835
      patch('sys_ustat.h.patch', when='@5.0:6.4,7.0:7.3,8.1')
      patch('sys_ustat-4.9.patch', when='@4.9')
  
      # this patch removes cylades support from gcc-5 and allows gcc-5 to be built
      # with newer glibc versions.
      patch('glibc-2.31-libsanitizer-3-gcc-5.patch', when='@5.3.0:5.5.0')
  
      # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95005
      patch('zstd.patch', when='@10')
  
      # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100102
      patch('https://gcc.gnu.org/git/?p=gcc.git;a=patch;h=fc930b3010bd0de899a3da3209eab20664ddb703',
            sha256='28c5ab3b564d83dd7e6e35b9c683141a4cb57ee886c5367e54a0828538b3c789', when='@10.1:10.3')
      patch('https://gcc.gnu.org/git/?p=gcc.git;a=patch;h=f1feb74046e0feb0596b93bbb822fae02940a90e',
            sha256='3e5029489b79fc0d47fd6719f3d5c9d3bbc727a4a0cbff161a5517e8a3c98cb6',  when='@11.1')
  
      build_directory = 'spack-build'
  
      @property
      def executables(self):
          names = [r'gcc', r'[^\w]?g\+\+', r'gfortran']
          suffixes = [r'', r'-mp-\d+\.\d', r'-\d+\.\d', r'-\d+', r'\d\d']
          return [r''.join(x) for x in itertools.product(names, suffixes)]
  
      @classmethod
      def filter_detected_exes(cls, prefix, exes_in_prefix):
          result = []
          for exe in exes_in_prefix:
              # On systems like Ubuntu we might get multiple executables
              # with the string "gcc" in them. See:
              # https://helpmanual.io/packages/apt/gcc/
              basename = os.path.basename(exe)
              substring_to_be_filtered = [
                  'c99-gcc',
                  'c89-gcc',
                  '-nm',
                  '-ar',
                  'ranlib',
                  'clang'  # clang++ matches g++ -> clan[g++]
              ]
              if any(x in basename for x in substring_to_be_filtered):
                  continue
              # Filter out links in favor of real executables on
              # all systems but Cray
              host_platform = str(spack.platforms.host())
              if os.path.islink(exe) and host_platform != 'cray':
                  continue
  
              result.append(exe)
  
          return result
  
      @classmethod
      def determine_version(cls, exe):
          try:
              output = spack.compiler.get_compiler_version_output(
                  exe, '--version'
              )
          except Exception:
              output = ''
          # Apple's gcc is actually apple clang, so skip it.
          # Users can add it manually to compilers.yaml at their own risk.
          if 'Apple' in output:
              return None
  
          version_regex = re.compile(r'([\d\.]+)')
          for vargs in ('-dumpfullversion', '-dumpversion'):
              try:
                  output = spack.compiler.get_compiler_version_output(exe, vargs)
                  match = version_regex.search(output)
                  if match:
                      return match.group(1)
              except spack.util.executable.ProcessError:
                  pass
              except Exception as e:
                  tty.debug(e)
  
          return None
  
      @classmethod
      def determine_variants(cls, exes, version_str):
          languages, compilers = set(), {}
          for exe in exes:
              basename = os.path.basename(exe)
              if 'g++' in basename:
                  languages.add('c++')
                  compilers['cxx'] = exe
              elif 'gfortran' in basename:
                  languages.add('fortran')
                  compilers['fortran'] = exe
              elif 'gcc' in basename:
                  languages.add('c')
                  compilers['c'] = exe
          variant_str = 'languages={0}'.format(','.join(languages))
          return variant_str, {'compilers': compilers}
  
      @classmethod
      def validate_detected_spec(cls, spec, extra_attributes):
          # For GCC 'compilers' is a mandatory attribute
          msg = ('the extra attribute "compilers" must be set for '
                 'the detected spec "{0}"'.format(spec))
          assert 'compilers' in extra_attributes, msg
  
          compilers = extra_attributes['compilers']
          for constraint, key in {
              'languages=c': 'c',
              'languages=c++': 'cxx',
              'languages=fortran': 'fortran'
          }.items():
              if spec.satisfies(constraint, strict=True):
                  msg = '{0} not in {1}'
                  assert key in compilers, msg.format(key, spec)
  
      @property
      def cc(self):
          msg = "cannot retrieve C compiler [spec is not concrete]"
          assert self.spec.concrete, msg
          if self.spec.external:
              return self.spec.extra_attributes['compilers'].get('c', None)
          result = None
          if 'languages=c' in self.spec:
              result = str(self.spec.prefix.bin.gcc)
          return result
  
      @property
      def cxx(self):
          msg = "cannot retrieve C++ compiler [spec is not concrete]"
          assert self.spec.concrete, msg
          if self.spec.external:
              return self.spec.extra_attributes['compilers'].get('cxx', None)
          result = None
          if 'languages=c++' in self.spec:
              result = os.path.join(self.spec.prefix.bin, 'g++')
          return result
  
      @property
      def fortran(self):
          msg = "cannot retrieve Fortran compiler [spec is not concrete]"
          assert self.spec.concrete, msg
          if self.spec.external:
              return self.spec.extra_attributes['compilers'].get('fortran', None)
          result = None
          if 'languages=fortran' in self.spec:
              result = str(self.spec.prefix.bin.gfortran)
          return result
  
      def url_for_version(self, version):
          # This function will be called when trying to fetch from url, before
          # mirrors are tried. It takes care of modifying the suffix of gnu
          # mirror path so that Spack will also look for the correct file in
          # the mirrors
          if (version < Version('6.4.0') and version != Version('5.5.0')) \
                  or version == Version('7.1.0'):
              self.gnu_mirror_path = self.gnu_mirror_path.replace('xz', 'bz2')
          return super(Gcc, self).url_for_version(version)
  
      def patch(self):
          spec = self.spec
          prefix = self.spec.prefix
  
          # Fix a standard header file for OS X Yosemite that
          # is GCC incompatible by replacing non-GCC compliant macros
          if 'yosemite' in spec.architecture:
              if os.path.isfile('/usr/include/dispatch/object.h'):
                  new_dispatch_dir = join_path(prefix, 'include', 'dispatch')
                  mkdirp(new_dispatch_dir)
                  new_header = join_path(new_dispatch_dir, 'object.h')
                  install('/usr/include/dispatch/object.h', new_header)
                  filter_file(r'typedef void \(\^dispatch_block_t\)\(void\)',
                              'typedef void* dispatch_block_t',
                              new_header)
  
          # Use installed libz
          if self.version >= Version('6'):
              filter_file('@zlibdir@',
                          '-L{0}'.format(spec['zlib'].prefix.lib),
                          'gcc/Makefile.in')
              filter_file('@zlibinc@',
                          '-I{0}'.format(spec['zlib'].prefix.include),
                          'gcc/Makefile.in')
  
          if spec.satisfies('+nvptx'):
              # backport of 383400a6078d upstream to allow support of cuda@11:
              filter_file('#define ASM_SPEC "%{misa=*:-m %*}"',
                          '#define ASM_SPEC "%{misa=*:-m %*; :-m sm_35}"',
                          'gcc/config/nvptx/nvptx.h',
                          string=True)
              filter_file('Target RejectNegative ToLower Joined '
                          'Enum(ptx_isa) Var(ptx_isa_option) Init(PTX_ISA_SM30)',
                          'Target RejectNegative ToLower Joined '
                          'Enum(ptx_isa) Var(ptx_isa_option) Init(PTX_ISA_SM35)',
                          'gcc/config/nvptx/nvptx.opt',
                          string=True)
  
      # https://gcc.gnu.org/install/configure.html
      def configure_args(self):
          spec = self.spec
  
          # Generic options to compile GCC
          options = [
              # Distributor options
              '--with-pkgversion=Spack GCC',
              '--with-bugurl=https://github.com/spack/spack/issues',
              # Xcode 10 dropped 32-bit support
              '--disable-multilib',
              '--enable-languages={0}'.format(
                  ','.join(spec.variants['languages'].value)),
              # Drop gettext dependency
              '--disable-nls'
          ]
  
          # Use installed libz
          if self.version >= Version('6'):
              options.append('--with-system-zlib')
  
          if 'zstd' in spec:
              options.append('--with-zstd-include={0}'.format(
                  spec['zstd'].headers.directories[0]))
              options.append('--with-zstd-lib={0}'.format(
                  spec['zstd'].libs.directories[0]))
  
          # Enabling language "jit" requires --enable-host-shared.
          if 'languages=jit' in spec:
              options.append('--enable-host-shared')
  
          # Binutils
          if spec.satisfies('+binutils'):
              binutils = spec['binutils'].prefix.bin
              options.extend([
                  '--with-gnu-ld',
                  '--with-ld=' + binutils.ld,
                  '--with-gnu-as',
                  '--with-as=' + binutils.join('as'),
              ])
  
          # enable_bootstrap
          if spec.satisfies('+bootstrap'):
              options.extend([
                  '--enable-bootstrap',
              ])
          else:
              options.extend([
                  '--disable-bootstrap',
              ])
  
          # Configure include and lib directories explicitly for these
          # dependencies since the short GCC option assumes that libraries
          # are installed in "/lib" which might not be true on all OS
          # (see #10842)
          #
          # More info at: https://gcc.gnu.org/install/configure.html
          for dep_str in ('mpfr', 'gmp', 'mpc', 'isl'):
              if dep_str not in spec:
                  options.append('--without-{0}'.format(dep_str))
                  continue
  
              dep_spec = spec[dep_str]
              include_dir = dep_spec.headers.directories[0]
              lib_dir = dep_spec.libs.directories[0]
              options.extend([
                  '--with-{0}-include={1}'.format(dep_str, include_dir),
                  '--with-{0}-lib={1}'.format(dep_str, lib_dir)
              ])
  
          # nvptx-none offloading for host compiler
          if spec.satisfies('+nvptx'):
              options.extend(['--enable-offload-targets=nvptx-none',
                              '--with-cuda-driver-include={0}'.format(
                                  spec['cuda'].prefix.include),
                              '--with-cuda-driver-lib={0}'.format(
                                  spec['cuda'].libs.directories[0]),
                              '--disable-bootstrap',
                              '--disable-multilib'])
  
          if sys.platform == 'darwin':
              options.extend([
                  '--with-native-system-header-dir=/usr/include',
                  '--with-sysroot={0}'.format(macos_sdk_path()),
                  '--with-libiconv-prefix={0}'.format(spec['iconv'].prefix)
              ])
  
          # enable appropriate bootstrapping flags
          stage1_ldflags = str(self.rpath_args)
          boot_ldflags = stage1_ldflags + ' -static-libstdc++ -static-libgcc'
          options.append('--with-stage1-ldflags=' + stage1_ldflags)
          options.append('--with-boot-ldflags=' + boot_ldflags)
  
          return options
  
      # run configure/make/make(install) for the nvptx-none target
      # before running the host compiler phases
      @run_before('configure')
      def nvptx_install(self):
          spec = self.spec
          prefix = self.prefix
  
          if not spec.satisfies('+nvptx'):
              return
  
          # config.guess returns the host triple, e.g. "x86_64-pc-linux-gnu"
          guess = Executable('./config.guess')
          targetguess = guess(output=str).rstrip('\n')
  
          options = getattr(self, 'configure_flag_args', [])
          options += ['--prefix={0}'.format(prefix)]
  
          options += [
              '--with-cuda-driver-include={0}'.format(
                  spec['cuda'].prefix.include),
              '--with-cuda-driver-lib={0}'.format(
                  spec['cuda'].libs.directories[0]),
          ]
  
          with working_dir('nvptx-tools'):
              configure = Executable("./configure")
              configure(*options)
              make()
              make('install')
  
          pattern = join_path(self.stage.source_path, 'newlibsource', '*')
          files = glob.glob(pattern)
  
          if files:
              symlink(join_path(files[0], 'newlib'), 'newlib')
  
          # self.build_directory = 'spack-build-nvptx'
          with working_dir('spack-build-nvptx', create=True):
  
              options = ['--prefix={0}'.format(prefix),
                         '--enable-languages={0}'.format(
                         ','.join(spec.variants['languages'].value)),
                         '--with-mpfr={0}'.format(spec['mpfr'].prefix),
                         '--with-gmp={0}'.format(spec['gmp'].prefix),
                         '--target=nvptx-none',
                         '--with-build-time-tools={0}'.format(
                             join_path(prefix,
                                       'nvptx-none', 'bin')),
                         '--enable-as-accelerator-for={0}'.format(
                             targetguess),
                         '--disable-sjlj-exceptions',
                         '--enable-newlib-io-long-long',
                         ]
  
              configure = Executable("../configure")
              configure(*options)
              make()
              make('install')
  
      @property
      def install_targets(self):
          if '+strip' in self.spec:
              return ['install-strip']
          return ['install']
  
      @property
      def spec_dir(self):
          # e.g. lib/gcc/x86_64-unknown-linux-gnu/4.9.2
          spec_dir = glob.glob('{0}/gcc/*/*'.format(self.prefix.lib))
          return spec_dir[0] if spec_dir else None
  
      @run_after('install')
      def write_rpath_specs(self):
          """Generate a spec file so the linker adds a rpath to the libs
             the compiler used to build the executable.
  
             .. caution::
  
                The custom spec file by default with *always* pass ``-Wl,-rpath
                ...`` to the linker, which will cause the linker to *ignore* the
                value of ``LD_RUN_PATH``, which otherwise would be saved to the
                binary as the default rpath. See the mitigation below for how to
                temporarily disable this behavior.
  
             Structure the specs file so that users can define a custom spec file
             to suppress the spack-linked rpaths to facilitate rpath adjustment
             for relocatable binaries. The custom spec file
             :file:`{norpath}.spec` will have a single
             line followed by two blanks lines::
  
                 *link_libgcc_rpath:
  
  
  
             It can be passed to the GCC linker using the argument
             ``--specs=norpath.spec`` to disable the automatic rpath and restore
             the behavior of ``LD_RUN_PATH``."""
          if not self.spec_dir:
              tty.warn('Could not install specs for {0}.'.format(
                       self.spec.format('{name}{@version}')))
              return
  
          gcc = self.spec['gcc'].command
          lines = gcc('-dumpspecs', output=str).splitlines(True)
          specs_file = join_path(self.spec_dir, 'specs')
  
          # Save a backup
          with open(specs_file + '.orig', 'w') as out:
              out.writelines(lines)
  
          # Find which directories have shared libraries
          rpath_libdirs = []
          for dir in ['lib', 'lib64']:
              libdir = join_path(self.prefix, dir)
              if glob.glob(join_path(libdir, "*." + dso_suffix)):
                  rpath_libdirs.append(libdir)
  
          if not rpath_libdirs:
              # No shared libraries
              tty.warn('No dynamic libraries found in lib/lib64')
              return
  
          # Overwrite the specs file
          with open(specs_file, 'w') as out:
              for line in lines:
                  out.write(line)
                  if line.startswith('*link_libgcc:'):
                      # Insert at start of line following link_libgcc, which gets
                      # inserted into every call to the linker
                      out.write('%(link_libgcc_rpath) ')
  
              # Add easily-overridable rpath string at the end
              out.write('*link_libgcc_rpath:\n')
              if 'platform=darwin' in self.spec:
                  # macOS linker requires separate rpath commands
                  out.write(' '.join('-rpath ' + lib for lib in rpath_libdirs))
              else:
                  # linux linker uses colon-separated rpath
                  out.write('-rpath ' + ':'.join(rpath_libdirs))
              out.write('\n')
          set_install_permissions(specs_file)
          tty.info('Wrote new spec file to {0}'.format(specs_file))
  
      def setup_run_environment(self, env):
          # Search prefix directory for possibly modified compiler names
          from spack.compilers.gcc import Gcc as Compiler
  
          # Get the contents of the installed binary directory
          bin_path = self.spec.prefix.bin
  
          if not os.path.isdir(bin_path):
              return
  
          bin_contents = os.listdir(bin_path)
  
          # Find the first non-symlink compiler binary present for each language
          for lang in ['cc', 'cxx', 'fc', 'f77']:
              for filename, regexp in itertools.product(
                      bin_contents,
                      Compiler.search_regexps(lang)
              ):
                  if not regexp.match(filename):
                      continue
  
                  abspath = os.path.join(bin_path, filename)
                  if os.path.islink(abspath):
                      continue
  
                  # Set the proper environment variable
                  env.set(lang.upper(), abspath)
                  # Stop searching filename/regex combos for this language
                  break
  